Section 5 - Operation
Oxygen Monitoring
Unsuccessful
Calibration
If, at the end of the calibration period, the % OXYGEN display area
remains blank, the calibration was not successful. (This condition is also
indicated by the Advisory messages O2 SENS ERR, O2 NOT CAL, and
O2 ALRM OFF in the central alarm display.)
Causes and
Solutions
An unsuccessful calibration can be caused by several conditions.
Cause Solution
Sensor was exposed to an
excessively lean or
excessively rich oxygen
calibration mixture.
Make sure that the sensor is exposed to
room air only for the entire calibration
period.
Sensor was exposed to a
constantly changing
calibration mixture.
Make sure that the sensor is exposed to
room air only for the entire calibration
period.
Sensor has not received
the proper waiting period.
If the sensor capsule has been removed
from the sensor assembly, a waiting
period equal to the time that the capsule
spent outside the sensor assembly (up to
one week) is necessary. New sensors
require a 15 minute waiting period.
Sensor is exhausted. If the oxygen sensor has decayed beyond
its useful service life (see the
“Specifications” section of the manual),
replace the decayed sensor with a new
sensor and allow the proper waiting
period.
Sensor is defective. If there is too great a difference between
the outputs of the two sensor halves,
replace the defective sensor with a new
sensor and allow the proper waiting
period.
Sensor is disconnected. When the sensor is disconnected, the
display area is blank, and the following
messages appear on the central alarm
display: 02 SENS DISC, 02 NOT CAL,
and 02 SENS DISC. If this happens,
reconnect the sensor cord to the interface
panel on the Narkomed 2B and press the
O2 CAL key again.
5-10-7
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